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                    <div id="mw-content-text" lang="en" dir="ltr" class="mw-content-ltr"><div class="t-navbar" style=""><div class="t-navbar-sep"> </div><div class="t-navbar-head"><a href="../c.html" title="c"> C</a><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="line-height:1.1em;">
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<tr class="t-nv"><td colspan="5"> <strong class="selflink"> Type support</strong> </td></tr>
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</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div><div class="t-navbar-head"><strong class="selflink"> Type support</strong><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="types/size_t.html" title="c/types/size t"><span class="t-lines"><span>size_t</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="types/ptrdiff_t.html" title="c/types/ptrdiff t"><span class="t-lines"><span>ptrdiff_t</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="types/NULL.html" title="c/types/NULL"><span class="t-lines"><span>NULL</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="types/max_align_t.html" title="c/types/max align t"><span class="t-lines"><span>max_align_t</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="types/offsetof.html" title="c/types/offsetof"><span class="t-lines"><span>offsetof</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="types/limits.html" title="c/types/limits"> Numeric limits</a></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="types/integer.html" title="c/types/integer"> Fixed width integer types</a> <span class="t-mark-rev t-since-c99">(C99)</span></td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div></div>
<p>See also <a href="language/types.html" title="c/language/types" class="mw-redirect"> type system overview</a> and <a href="language/arithmetic_types.html" title="c/language/arithmetic types"> arithmetic types defined by the language</a>.
</p>
<h3><span class="mw-headline" id="Basic_types">Basic types</span></h3>
<h4><span class="mw-headline" id="Additional_basic_types_and_convenience_macros">Additional basic types and convenience macros</span></h4>
<table class="t-dsc-begin">

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;stddef.h&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="types/size_t.html" title="c/types/size t"> <span class="t-lines"><span>size_t</span></span></a></div></div>
</td>
<td>   unsigned integer type returned by the <a href="language/sizeof.html" title="c/language/sizeof"><tt>sizeof</tt></a> operator <br> <span class="t-mark">(typedef)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="types/ptrdiff_t.html" title="c/types/ptrdiff t"> <span class="t-lines"><span>ptrdiff_t</span></span></a></div></div>
</td>
<td>   signed integer type returned when subtracting two pointers <br> <span class="t-mark">(typedef)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="types/NULL.html" title="c/types/NULL"> <span class="t-lines"><span>NULL</span></span></a></div></div>
</td>
<td>   implementation-defined null pointer constant <br> <span class="t-mark">(macro constant)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="types/max_align_t.html" title="c/types/max align t"> <span class="t-lines"><span>max_align_t</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div>
</td>
<td>   a type with alignment requirement as great as any other scalar type  <br> <span class="t-mark">(typedef)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="types/offsetof.html" title="c/types/offsetof"> <span class="t-lines"><span>offsetof</span></span></a></div></div>
</td>
<td>   byte offset from the beginning of a struct type to specified member <br> <span class="t-mark">(function macro)</span> </td></tr>

<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;stdbool.h&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>bool</span></span></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span><span class="t-mark-rev t-until-c23">(until C23)</span></span></span></div></div>
</td>
<td>   convenience macro, expands to <a href="keyword/_Bool.html" title="c/keyword/ Bool"><tt>_Bool</tt></a> <br> <span class="t-mark">(keyword macro)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>true</span></span></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span><span class="t-mark-rev t-until-c23">(until C23)</span></span></span></div></div>
</td>
<td>   expands to integer constant <code>1</code> <br> <span class="t-mark">(macro constant)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>false</span></span></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span><span class="t-mark-rev t-until-c23">(until C23)</span></span></span></div></div>
</td>
<td>   expands to integer constant <code>0</code> <br> <span class="t-mark">(macro constant)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__bool_true_false_are_defined</span></span></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span><span class="t-mark-rev t-deprecated-c23">(deprecated in C23)</span></span></span></div></div>
</td>
<td>   expands to integer constant <code>1</code> <br> <span class="t-mark">(macro constant)</span>
</td></tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;stdalign.h&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>alignas</span></span></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c11">(C11)</span><span class="t-mark-rev t-until-c23">(until C23)</span></span></span></div></div>
</td>
<td>  convenience macro, expands to keyword <a href="keyword/_Alignas.html" title="c/keyword/ Alignas"><tt>_Alignas</tt></a> <br> <span class="t-mark">(keyword macro)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>alignof</span></span></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c11">(C11)</span><span class="t-mark-rev t-until-c23">(until C23)</span></span></span></div></div>
</td>
<td>  convenience macro, expands to keyword <a href="keyword/_Alignof.html" title="c/keyword/ Alignof"><tt>_Alignof</tt></a> <br> <span class="t-mark">(keyword macro)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__alignas_is_defined</span></span></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c11">(C11)</span><span class="t-mark-rev t-until-c23">(until C23)</span></span></span></div></div>
</td>
<td>   expands to integer constant <code>1</code> <br> <span class="t-mark">(macro constant)</span>
</td></tr>


<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>__alignof_is_defined</span></span></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c11">(C11)</span><span class="t-mark-rev t-until-c23">(until C23)</span></span></span></div></div>
</td>
<td>   expands to integer constant <code>1</code> <br> <span class="t-mark">(macro constant)</span>
</td></tr>


<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code>&lt;stdnoreturn.h&gt;</code> </div>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>noreturn</span></span></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c11">(C11)</span><span class="t-mark-rev t-deprecated-c23">(deprecated in C23)</span></span></span></div></div>
</td>
<td>   convenience macro, expands to <a href="keyword/_Noreturn.html" title="c/keyword/ Noreturn"><tt>_Noreturn</tt></a> <br> <span class="t-mark">(keyword macro)</span>
</td></tr>

</table>
<h4><span class="mw-headline" id="Fixed_width_integer_types_.28since_C99.29"><a href="types/integer.html" title="c/types/integer"> Fixed width integer types</a> <span class="t-mark-rev t-since-c99">(since C99)</span></span></h4>
<h4><span class="mw-headline" id="Numeric_limits"><a href="types/limits.html" title="c/types/limits"> Numeric limits</a></span></h4>
<h3><span class="mw-headline" id="Notes">Notes</span></h3>
 <table class="t-rev-begin">
<tr class="t-rev t-since-c99 t-until-c23"><td>
<p>The type of <code>true</code> and <code>false</code> is <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">int</span></span></span> rather than <span class="t-c"><span class="mw-geshi c source-c">_Bool</span></span>.
</p><p>A program may undefine and perhaps then redefine the macros <code>bool</code>, <code>true</code> and <code>false</code>. However, such ability is a deprecated feature.
</p>
</td>
<td><span class="t-mark-rev t-since-c99">(since C99)</span><br><span class="t-mark-rev t-until-c23">(until C23)</span></td></tr>
<tr class="t-rev t-since-c23"><td>
<p>The type of <code>true</code> and <code>false</code> is <code>bool</code>. It is unspecified whether any of <code>bool</code>, <code>_Bool</code>, <code>true</code>, or <code>false</code> is implemented as a predefined macro.
</p><p>If <code>bool</code>, <code>true</code>, or <code>false</code> (but not <code>_Bool</code>) is defined as a predefined macro, a program may undefine and perhaps redefine it.
</p>
</td>
<td><span class="t-mark-rev t-since-c23">(since C23)</span></td></tr>
</table>
<h3><span class="mw-headline" id="Example">Example</span></h3>
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">Run this code</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="c source-c"><pre class="de1"><span class="co2">#include &lt;stdio.h&gt;</span>
<span class="co2">#include &lt;stdbool.h&gt;</span>
<span class="co2">#include &lt;stdalign.h&gt;</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
    <a href="io/fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"%d %d %d<span class="es1">\n</span>"</span>, <span class="kw2">true</span> <span class="sy3">&amp;&amp;</span> <span class="kw2">false</span>, <span class="kw2">true</span> <span class="sy3">||</span> <span class="kw2">false</span>, <span class="sy3">!</span><span class="kw2">false</span><span class="br0">)</span><span class="sy4">;</span>
    <a href="io/fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"%d %d<span class="es1">\n</span>"</span>, <span class="kw2">true</span> <span class="sy3">^</span> <span class="kw2">true</span>, <span class="kw2">true</span> <span class="sy2">+</span> <span class="kw2">true</span><span class="br0">)</span><span class="sy4">;</span>
    <a href="io/fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"%zu<span class="es1">\n</span>"</span>, alignof<span class="br0">(</span><span class="kw4">short</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>Possible output:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">0 1 1
0 2
2</pre></div></div> 
</div>
<h3><span class="mw-headline" id="References">References</span></h3>
<div class="t-ref-std-17">
<ul><li> C17 standard (ISO/IEC 9899:2018): 
</li></ul>
<dl><dd><ul><li> 7.15 Alignment &lt;stdalign.h&gt; (p: 196)
</li></ul>
</dd></dl>
<dl><dd><ul><li> 7.18 Boolean type and values &lt;stdbool.h&gt; (p: 210)
</li></ul>
</dd></dl>
<dl><dd><ul><li> 7.19 Common definitions &lt;stddef.h&gt; (p: 211)
</li></ul>
</dd></dl>
<dl><dd><ul><li> 7.23 _Noreturn &lt;stdnoreturn.h&gt; (p: 263)
</li></ul>
</dd></dl>
<dl><dd><ul><li> 7.31.9 Boolean type and values &lt;stdbool.h&gt; (p: 332)
</li></ul>
</dd></dl>
</div>
<div class="t-ref-std-11">
<ul><li> C11 standard (ISO/IEC 9899:2011): 
</li></ul>
<dl><dd><ul><li> 7.15 Alignment &lt;stdalign.h&gt; (p: 268)
</li></ul>
</dd></dl>
<dl><dd><ul><li> 7.18 Boolean type and values &lt;stdbool.h&gt; (p: 287)
</li></ul>
</dd></dl>
<dl><dd><ul><li> 7.19 Common definitions &lt;stddef.h&gt; (p: 288)
</li></ul>
</dd></dl>
<dl><dd><ul><li> 7.23 _Noreturn &lt;stdnoreturn.h&gt; (p: 361)
</li></ul>
</dd></dl>
<dl><dd><ul><li> 7.31.9 Boolean type and values &lt;stdbool.h&gt; (p: 456)
</li></ul>
</dd></dl>
</div>
<div class="t-ref-std-c99">
<ul><li> C99 standard (ISO/IEC 9899:1999): 
</li></ul>
<dl><dd><ul><li> 7.18 Boolean type and values &lt;stdbool.h&gt; (p: 253)
</li></ul>
</dd></dl>
<dl><dd><ul><li> 7.19 Common definitions &lt;stddef.h&gt; (p: 254)
</li></ul>
</dd></dl>
<dl><dd><ul><li> 7.26.7 Boolean type and values &lt;stdbool.h&gt; (p: 401)
</li></ul>
</dd></dl>
</div>
<div class="t-ref-std-c89">
<ul><li> C89/C90 standard (ISO/IEC 9899:1990): 
</li></ul>
<dl><dd><ul><li> 4.1.5 Common definitions &lt;stddef.h&gt; 
</li></ul>
</dd></dl>
</div>
<h3><span class="mw-headline" id="See_also">See also</span></h3>
<table class="t-dsc-begin">

</table>

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